<template>
  <div class="list" ref="wrapper">
   <div>
     <div class="area">
       <div class="title border-topbottom">当前城市</div>
       <div class="button-list">
         <div class="button-wrapper">
           <div class="button">{{this.currentCity}}</div>
         </div>
       </div>
     </div>
     <div class="area">
       <div class="title border-topbottom">热门城市</div>
       <div class="button-list">
         <div class="button-wrapper" v-for="item of hot" :key="item.id"
              @click="handleCityClick(item.name)"
         >
           <div class="button">{{item.name}}</div>
         </div>
       </div>
     </div>
     <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
       <div class="title border-topbottom">{{key}}</div>
       <div class="item-list">
         <div class="item border-bottom"
           v-for="innerItem of item"
           :key="innerItem.id"
           @click="handleCityClick(innerItem.name)"
         >{{innerItem.name}}</div>
       </div>
     </div>
   </div>
  </div>
</template>

<script>
import BScroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default{
  name:'CityList',
  props:{
    hot:Array,
    cities:Object,
    letter:String
  },
  // 以对象的形式,把city映射完了就变成currentCity了
  computed:{
    ...mapState({
      currentCity:'city'
    })
  },
 methods:{
   handleCityClick (city) {
     this.changeCity(city)
     this.$router.push('/')
   },
   ...mapMutations(['changeCity'])
  },
  watch:{
    letter () {
      if(this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  },
  mounted () {
    this.scroll = new BScroll(this.$refs.wrapper)
  }
}
</script>
<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color :#CCC
    &:after
      border-color :#CCC
  .border-bottom
    &:before
      border-color :#CCC
  .list
    overflow :hidden
    position :absolute
    top:1.58rem
    left :0
    right :0
    bottom :0
    .title
      line-height :.54rem
      padding-left :.2rem
      color :#666
      font-size :.26rem
      background :#eee
    .button-list
      overflow :hidden
      padding :.1rem .6rem .1rem .1rem
      .button-wrapper
        float :left
        width :33.33%
        .button
          margin :.1rem
          padding :.1rem 0
          text-align :center
          border :.02rem solid #ccc
          border-radius :.06rem
    .item-list
      .item
        line-height :.76rem
        padding-left :.2rem


</style>
